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Types of 5-HTP: Forms & Bioavailability

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Forms Comparison

FormBioavailabilityBest For
5-HTP Capsules (Griffonia simplicifolia Extract)High (70% oral bioavailability)Mood and sleep support — standard form with well-characterized absorption
Enteric-Coated 5-HTPHighReduced nausea — enteric coating delays release past the stomach, minimizing GI side effects
Time-Release 5-HTPModerate-HighSustained serotonin support — gradual release for more stable serotonin levels throughout the day

5-HTP Capsules (Griffonia simplicifolia Extract)

Bioavailability: High (70% oral bioavailability). Best for: Mood and sleep support — standard form with well-characterized absorption.

Enteric-Coated 5-HTP

Bioavailability: High. Best for: Reduced nausea — enteric coating delays release past the stomach, minimizing GI side effects.

Time-Release 5-HTP

Bioavailability: Moderate-High. Best for: Sustained serotonin support — gradual release for more stable serotonin levels throughout the day.

Full 5-HTP Guide

References

  1. (). A randomized, placebo-controlled trial of an amino acid preparation on timing and quality of sleep. American Journal of Therapeutics. DOI
  2. (). A functional-dimensional approach to depression: serotonin deficiency as a target syndrome in a comparison of 5-hydroxytryptophan and fluvoxamine. Psychopathology. DOI
  3. (). 5-Hydroxytryptophan: a review of its antidepressant efficacy and adverse effects. Journal of Clinical Psychopharmacology.
  4. (). Eating behavior and adherence to dietary prescriptions in obese adult subjects treated with 5-hydroxytryptophan. American Journal of Clinical Nutrition. DOI